Idaho Highway 21, the Ponderosa Pine Scenic Byway, is the primary corridor for reaching hot springs near Boise. The route climbs northeast from the Treasure Valley through the Boise National Forest, passing The Springs resort at mile 37 near Idaho City and continuing toward Lowman where several primitive springs cluster along the South Fork Payette River.
Bonneville Hot Springs, about 75 miles from Boise near milepost 91 on Highway 21, features a cast iron soak shack and creek pools reached by a 0.4-mile trail. Pine Flats Hot Springs, 3 miles further west, has a hot waterfall and cliff pools above the Payette. For a quieter backcountry soak, Loftus Natural Hot Spring sits on Middle Fork Boise River Road, roughly 60 miles from downtown via the Lucky Peak corridor. Southwest of Boise, Givens Hot Springs on ID-78 near Marsing offers a year-round indoor pool.
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